Iran’s president said his country would fiercely resist efforts to contain its regional influence as President Donald Trump weighs withdrawing from the nuclear deal , a scenario that threatens to escalate the country’s destabilizing rivalry with Saudi Arabia. In defiant speeches on Monday and over the weekend, President Hassan Rouhani offered the clearest glimpse yet of how his country plans to react if Mr. Trump withdraws from the nuclear pact by a self-imposed deadline on Saturday. Mr. Rouhani rejected a series of concessions demanded by the Saudis and the U.S., including limits on Iran’s ballistic missile program—which isn’t covered in the nuclear pact—and its interference across the Middle East. “If the U.S.’s goal is for our country to have no independence and influence in the region, our people will stand against them fiercely as they have done over the past 40 years,” Mr. Rouhani said in a speech broadcast […]